Pump



C. C. CARROW Feb. 5 1924.

BUMP

Filed March 16. 1921 awue/wbo'o Clsnxde C. Carr-0w 41 W,M /MK @mm; W/M- uudu rate rat. e, r

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Application tiled march it, $921. en-lat We. @1523.

To all whom it may concern:

Be it lmown that l, CLAUDE C. CAnRow, a citizen of the United States, and a resident of thecity of Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful improvements in Pumps, of which the followmg is a specification, reference being had to the accompanying drawing.

My invention more particularly relates to air pumps such as used for inflating tires of automobiles although it is equally well ada ted for use in connection with other kin s of pumps. lit .is well hiown that the valves of pumpsof the character aforesaid often shrink or contract within the cylinder especially when the pump has not been used for a considerable period of time, thereby rendering the pum entirely inoperative, or operative at less t an maximum eficiency, and necessitating the removal of the piston from the cylinder and the expansion or adjustment of the valve to restore the pump to a satisfactorily operative condition.

As tire pumps are ordinarily carried in the tool box'of the automobile, frequently for months at a. time, without being used, it is often found when the pump is put into service'that it is entirely or substantially inoperative-for the reasons stated, requirin the expenditure of a considerablelength 0 time and the disassembling and reassembling of the pump before it can be used to inflate the tire.

A principal object at the invention is to obviate these disadvantages by the provision of means in a pump for expanding and ad: justing from. the outside of the pump cylinder the leather or other valve of the iston Within the cylinder so that if it be ound when the pump is placed in service that it does not operate satisfactorily on account of the shrinkage or contraction or the valve,

the latter may be readily and convenientlyex anded into intimate contact with the cy indcr wall and thus put in a condition to operate at maximum efficiency by an extremely simple adjustment performed en- .tirely from the outside of the pump and without in any way necessitatii 1; taking the pump apart or so 1 the bone or clothes of the operator.

Further objects or my invention are to provide means of the character and forthe purposes aforesaidwhich are extremely simple in operation, not liable to get: out of precise form and arrangement of the various elements or parts, as the same may be varied in minor particulars from those shown as may be desired. In the said drawings, Figure 1. is a fragmentary central vertical section of a tire pump embodying one form of my invention, certain of the parts being shown in elevation, the articular form of pump illustrated bein e ective to compress the air within the cylinder on the up stroke of the iston; Fig. 2 isa detail view in elevain Fig. 1 and."

tion-o one of the parts shown Fig. 3 is a fraentary view in centra section, with certain parts shown in elevation,-

of the piston and adjacent parts of a pum embodying my invention and adapted to e' feet the compression of the air in the cylin-. der on the down stroke. of the piston Like numerals are used to designate correspond iniparts in the. several figures.

eferring to the drawing, the ump shown in Fig. 1 comprises the usua cylinder 1 having a cap 2 which may be provided with an outlet for the air compressed within thec linder and controlled by a check alve in the ordinary nner, the outlet and check valve not being shown. lhe usual plunger,

dipasses centrally through the cap and is adap to carry adjacent its lower end the usual cup-shaped valve washer t of leather or other suitable material. Below the washer and more nearly adjacent the end of the plunger may be positioned a plain washer 5 of leather or other suitable material located between a pair of spaced metallic washers 6, 6, a nut 7 threaded onto the end of the plunger 3 being efiective to maintain these rte in position on the end of theplungr. 1 upper end of the plunger is provided with the usual handle 8 conveniently. positioned'between a pair of nuts 9, 9, threaded onto the upperrend of the plunger and 'servtion therebetween and without in any in to secure the handle in rigid operative re ation therewith. The arrangement of the several parts to which reference has hitherto been made is common to most pumps of this general character and will be readily understood by those familiar with the art.

A tube or sleeve 10 is arranged to surround the ma'or portion of the plunger 3 and is adapts to move unitarily therewith in the o ration of the pump. This sleeve passes t rough the cap 2 and abuts at its upper end a ainst an adjusting nut 12 which is positioned on the threaded upper end of the plunger below the lower locking nut 9, while the lower end of the tube or sleeve abuts against an adjusting disc 14 which is loosely positioned on the lower end of the plunger above the valve washer 4, the plunger preferably being conveniently slightly reduced in diameter adjacent its lower end as shown. The adjusting disc is preferably in the form of an inverted truncated cone and is adapted to slightly enter the interior of a s lit ringer annulus 15 which is ositioned within the cup-shaped valve was er 4 in such manner as to lie in the curve or an le formed between the bottom and sides 0t the washer as clearly shown in Fig. 1.

With the parts constructed and arranged substantially as described it will be evident that by screwing down on the adjusting nut 12,,while holding the plunger from revolvmg, the tube or sleeve 10 may be forced downwardly relatively to the plunger to impart, through its abutting contact with the adjustin disc 14, a similar movement thereto, whic is efiective to force the disc progressively into the split ring or annulus 15- to expand the same and thus {game the sides 9f the valve washer 4 radially outward and into intimate contact. with the interior of the cylinder 1, the degree of frictional engagement between the washer and the cyl- 1n er being regulated by the distance the nut 12 is moved on the plunger. In this mannor the valve washer may be very nicely adjusted so as to brin about the necessary dees of engagement between the washer and t e cylinder without causing excessive fricmanner disassembling the pump or removing the washer and adjacent parts from the cylinder.

In Fig. 3 I have shown a slightly moditied form of the invention as embodied in a pump adapted to effect compression of the air or other fluid in the cylinder on the down stroke thereof. In this case the washer 4 is sitioned on the lunger with its open end irected downwar ly, the washer 5 and metallic washers 6 being positioned above the valve washer with the uppermost of the metallic washers in contact with the lower end of the tube or sleeve 10. The adjusting weaves disc 14, which may be similar in construction to the corresponding disc shown in Fig. 1, is supported on the plunger below the valve was er in normal as distinguished from inverted position, and is adapted to contact with and enter the splitring or annulus 15 positioned within the valve washer,

the nut 7 on the lower end of the plunger abutting against the lower face of the adjusting disc and reventin the disc from moving downwar ly on the plun er. In this form of the invention the ad ustment is accom lished in a manner similar to that already escribed, namely, by movement of the nut 12 (not shown) positioned on the upper end of the plunger 3 a ainst the u per end of sleeve 10 which is e active to raw the plunger 3 upwardly within the sleeve and in turn the adjusting disc upwardly into the annulus 15 to expand the same and force the walls of the valve washer radially outward into contact with the interior of the cylinder 1.

It will be evident that in either form of the invention shown, the adjustment of the valve washer may be readily performed from the outside of the pump b the simple movement of the adjusting nut 12 so that at any time if it is found that the. valve washer is not properly contacting with the interior of the cylinder so as to produce the maximum eliiciency of the pump, a slight movement of the adjusting nut is eifective to bring the valve washer into roperposition and the pum to maximums cienc While I ave herein describe certain forms of my invention with considerable articularity and have shown them as emodied in an air pump adapted for the inflation of tires and the like, it will be understood that the invention may be employed with equal facility in other forms of pumps intended for the pumping of air or other fluids, and additionally that the details of construction and arran ment of the several parts ma be varied-1n minor articulars from those illustrated and descrlbed without departing from the spirit and scope of the invention as defined in the appended claims.

Having thus described my invention, I claim and desire to protect by Letters Patent of the United States:

1. In a pump having a cylinder, the combination of a cup-shaped expandible valve washer disposed in the cylinder, a plunger extendin through the washer and outside of the cylinder, means carried by the plunger and contacting with the outer face of the washer to afiord support thereto, a split ring disposed within the washer, a conical adjust ing disk disposed on the plunger and adapted to enter the ring, a sleeve surrounding and longitudinally movable relatively to the plunger, and means disposed outside of the cylinder for effecting relative movement between the sleeve and the plunger to force said disk into the ring to expand the washer against the wall of the cylinder.

2. In a pump having a cylinder, the combination of a cup-shaped valve washer disposed within the cylinder, a" plunger extending through the washer and outside of the cylinder, a washer disposed? on the plunger and contacting with the outer face of the bottom of the cup-shaped washer to afi'ord support thereto in one direction, a ring of circular cross. section and transversely split at a single point disposed in the cup-shaped washer at the junction of the plunger, and means disposed outside of the cylinder for effecting relative longitudinal movement between the sleeve and the plunger to force the disk into the ring and in turn effect radial expansion of the cupshaped washer against the wall of the cylinder. I

In witness whereof I have hereunto set my hand this 14th da of March, A. D. 1921.

, CLAUDE C. CABROW. 

